Display screen or portion thereof with a graphical user interface set



The FIGURE is a front view of a display screen or portion thereof with a graphical user interface set according to our new design.

The outermost peripheral broken lines illustrate a display screen or portion thereof and form no part of the claimed design. The claim is directed to the collective appearance of the graphical user interface set shown in the figures, but no claim is made to the relative position or arrangement of elements of the set. The remaining broken lines represent elements of the display screen or portion thereof with a graphical user interface set that form no part of the claimed design. 

CLAIM We claim the ornamental design for a display screen or portion thereof with a graphical user interface set, as shown and described. 